Log changes and replace old behavior

CHANGES.rst

@@ -17,6 +17,7 @@ New features:
 
 - Add attributes to the calendar for properties ``NAME``, ``DESCRIPTION``, and ``COLOR``. See `Issue 655 <https://github.com/collective/icalendar/issues/655>`_.
 - Add ``sequence`` attribute to ``Event``, ``Todo``, and ``Journal`` components. See `Issue 802 <https://github.com/collective/icalendar/issues/802>`_.
+- Add compatibility to :rfc:`6868`, see `Issue 652 <https://github.com/collective/icalendar/issues/652>`_.
 
 Bug fixes:
 

src/icalendar/tests/test_property_params.py

@@ -89,8 +89,9 @@ def test_parameter_keys_are_uppercase():
         # a single quote in parameter value - double quote the value
         ("Aramis d'Alameda", '"Aramis d\'Alameda"'),
         ("Арамис д'Аламеда", '"Арамис д\'Аламеда"'),
-        # double quote is replaced with single quote
-        ('Aramis d"Alameda', '"Aramis d\'Alameda"'),
+        # Before, double quote is replaced with single quote
+        # Since RFC 6868, we replace this with ^'
+        ('Aramis d"Alameda', '"Aramis d^\'Alameda"'),
     ],
 )
 def test_quoting(cn_param, cn_quoted):